.TH deductionguidesforstd::valarray 3 "2024.06.10" "http://cppreference.com" "C++ Standard Libary"
.SH NAME
deductionguidesforstd::valarray \- deductionguidesforstd::valarray

.SH Synopsis
   Defined in header <valarray>
   template< typename T, std::size_t cnt >                   \fI(since C++17)\fP
   valarray( const T(&)[cnt], std::size_t ) -> valarray<T>;

   This deduction guide is provided for std::valarray to allow deduction from array and
   size (note that deduction from pointer and size is covered by the implicit guides).

.SH Example


// Run this code

 #include <iostream>
 #include <valarray>

 int main()
 {
     int a[] = {1, 2, 3, 4};
     std::valarray va(a, 3); // uses explicit deduction guide
     for (int x : va)
         std::cout << x << ' ';
     std::cout << '\\n';
 }

.SH Output:

 1 2 3
